ZyXEL Communications Vantage CNM 2.3 User Manual page 584

Chapter 31 Maintenance
After click Import, you may get the following error message if any device(s) in
the imported list have already existed in the Vantage CNM. You can edit the device
list file, remove the duplicated device information and import again.
Figure 319 CNM System Setting > Maintenance > Device List Import Conflict
If you receive the following successful message, click Back to go to the previous
screen. You have to refresh the navigation panel to view the latest device list.
Figure 320 CNM System Setting > Maintenance > Device List Import Successful
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Vantage CNM User's Guide